ENGR00182456-2 HDMI AUDIO: register/unregister when audio pcm open/close

In this patch:

1. Register substream into HDMI core driver when HDMI audio PCM is open.
2. Unregister substream out of HDMI core driver when HDMI audio PCM is
close.
Signed-off-by: Chen Liangjun <b36089@freescale.com>

sound/soc/imx/imx-hdmi-dma.c

@@ -1195,6 +1195,12 @@ static int hdmi_dma_open(struct snd_pcm_substream *substream)
 		(int)clk_get_rate(hdmi_dma_priv->isfr_clk),
 		(int)clk_get_rate(hdmi_dma_priv->iahb_clk));
 
+	ret = mxc_hdmi_register_audio(substream);
+	if (ret < 0) {
+		pr_err("ERROR: HDMI is not ready!\n");
+		return ret;
+	}
+
 	hdmi_fifo_reset();
 
 	ret = snd_pcm_hw_constraint_integer(substream->runtime,
@@ -1215,6 +1221,7 @@ static int hdmi_dma_close(struct snd_pcm_substream *substream)
 	struct imx_hdmi_dma_runtime_data *rtd = runtime->private_data;
 
 	hdmi_dma_irq_disable(rtd);
+	mxc_hdmi_unregister_audio(substream);
 
 	clk_disable(rtd->iahb_clk);
 	clk_disable(rtd->isfr_clk);